Support for napper? (8)
I believe the answer is:
headrest
'support for napper?' is the definition.
'headrest' can be an answer for 'support' (I've seen this before). I am not sure about the 'for napper?' bit.
'support for napper?' is the wordplay.
'support' becomes 'rest' (e.g. a shoulder rest is a support for shoulder).
'for' means one lot of letters go next to another (I've seen this in other clues).
'napper?' becomes 'head' (I can't explain this - if you can you should believe this answer much more).
'rest' put after 'head' is 'HEADREST'.
Can you help me to learn more?
(Other definitions for headrest that I've seen before include "Cushion on top of car seat" , "support to chairman?" , "With capital support" , "Capital supporter" , "Chair back support" .)